李伟兴 09:31:13
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .box {
      position: relative;
      width: 1000px;
      height: 200px;
      background-color: pink;
      margin: 100px auto;
      text-align: center;
      font-size: 50px;
      line-height: 200px;
      font-weight: 700;
    }

    .box1 {
      position: absolute;
      right: 20px;
      top: 10px;
      width: 20px;
      height: 20px;
      background-color: skyblue;
      text-align: center;
      line-height: 20px;
      font-size: 16px;
      cursor: pointer;
    }
  </style>
</head>

<body>
  <div class="box">
    我是广告
    <div class="box1">X</div>
  </div>
  <div class="box">
    我是广告
    <div class="box1">X</div>
  </div>
  <div class="box">
    我是广告
    <div class="box1">X</div>
  </div>
  <script>
    // // 1. 获取事件源
    // const box1 = document.querySelector('.box1')
    // //  关闭的是大盒子
    // const box = document.querySelector('.box')
    // // 2. 事件侦听
    // box1.addEventListener('click', function () {
    //   box.style.display = 'none'
    // })
    const box1 = document.querySelectorAll('.box1')
    for (let i = 0; i < box1.length; i++) {
      box1[i].addEventListener('click', function () {
        this.parentNode.style.display = 'none'
      })
    }
  </script>
</body>

</html>